/**
 * Copyright 2000 self.com.au
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. (http://www.apache.org/licenses/LICENSE-2.0)
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed 
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for 
 * the specific language governing permissions and limitations under the License.
 *
 * <dhamma-message src="Atisha (11th century Tibetan Buddhist master)">
 * 	The greatest achievement is selflessness. The greatest worth is self-mastery.
 * 	The greatest quality is seeking to serve others. The greatest precept is continual awareness.
 * 	The greatest medicine is the emptiness of everything. The greatest action is not conforming with the worlds ways.
 * 	The greatest magic is transmuting the passions. The greatest generosity is non-attachment.
 * 	The greatest goodness is a peaceful mind. The greatest patience is humility.
 * 	The greatest effort is not concerned with results. The greatest meditation is a mind that lets go.
 * 	The greatest wisdom is seeing through appearances. 
 * </dhamma-message>
 *
 * @author Ashin Wimalajeewa
 */
package self.amigo.io;

import java.io.*;
import java.util.*;

import org.w3c.dom.*;
import org.xml.sax.*;

import self.gee.*;
import self.xml.*;

public class DiagramReader extends FilterReader {
  public DiagramReader( Reader src ) {
    super( src );
  }
  
  public IDiagram readDiagram() throws IOException {
    InputSource adapter = new InputSource( in );
    try {
      Document doc = DomUtils.getDocumentBuilder().parse( adapter );
      return constructObjectFromDocTree( doc );
    } catch ( Exception err ) {
      err.printStackTrace();
      throw new IOException( err.getMessage() );
    }
  }
  
  private IDiagram constructObjectFromDocTree( Document doc ) throws Exception {
    Node ateElem = doc.getDocumentElement();
    Node diag = ateElem.getFirstChild().getNextSibling();
    String className = diag.getNodeName();
    IDiagram src = (IDiagram) Class.forName( className ).newInstance();
    HashMap idObjLookup = new HashMap();
    src.readFrom( diag, idObjLookup );
    return src;
  }
}